sedimentation field-flow fractionation

Sedimentation field-flow fractionation is a separation technique that utilizes a field applied perpendicular to a flow stream within a narrow channel. In this method, a centrifugal force, or gravity, is used to move particles toward the channel walls. Due to the varying flow velocity across the channel (faster in the center, slower at the walls), different substances migrate at different rates, leading to their separation. This technique is particularly effective for separating particles and substances of colloid size, such as latex particles used in paints. Other field-separation techniques include electrophoresis and ultracentrifugation, which separate substances based on charge and mass, respectively.12